Quizartinib Receives Orphan Drug Designation from Japanese MHLW

Daiichi Sankyo Company announced quizartinib, an investigational FLT3 inhibitor, has been granted Orphan Drug designation by the Japan Ministry of Health, Labour and Welfare (MHLW) for the treatment of FLT3-mutated acute myeloid leukemia (AML).

"There is a critical need for new treatment options for patients with FLT3-ITD AML, especially given the poor prognosis associated with this subtype of AML," said Kouichi Akahane, PhD, MBA, Executive Officer, Head of Oncology Function, R&D Division, Daiichi Sankyo. "Following the recent U.S. FDA Breakthrough Therapy designation for quizartinib, receiving Orphan Drug designation is another important regulatory milestone that will help accelerate the development of quizartinib in Japan. We look forward to working closely with the Japan MHLW to bring quizartinib to patients as quickly as possible."

The Japan MHLW Orphan Drug designation system is designed to promote research activities and support the development of orphan drugs for serious, difficult-to-treat diseases that affect fewer than 50,000 patients in Japan, and for which significant unmet medical need exists. An investigational compound can qualify for Orphan Drug designation if there is no approved alternative treatment option or if high efficacy or safety compared to existing treatment options is expected. Compounds receiving Orphan Drug designation qualify for several measures intended to support development, including, but not limited to, guidance and subsidies for research and development activities, priority consultation for clinical development and priority review of applications.

Quizartinib is the first FLT3 inhibitor to prolong overall survival as an oral, single agent compared to chemotherapy in a randomized, phase 3 trial (QuANTUM-R) in patients with relapsed/refractory FLT3-ITD AML. Results of QuANTUM-R were presented during the plenary program at the 23rd Congress of the European Hematology Association in June 2018.

The safety profile observed in QuANTUM-R appears consistent with that observed at similar doses in the quizartinib clinical development program. Incidence of treatment-emergent adverse events was comparable between patients who received single agent quizartinib and those who received salvage chemotherapy. The most common adverse events (>30 percent, any Grade) in patients treated with quizartinib included nausea, thrombocytopenia, fatigue, musculoskeletal pain, pyrexia, anemia, neutropenia, febrile neutropenia, vomiting and hypokalemia.

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